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Hi i have a question with a function, i can't know what kind of tipe they are: f ( x ) = x 3 +

Hi i have a question with a function, i can't know what kind of tipe they are:

f(x)=x3+2

f(x)=x21+5

f(x)=2x

I don't know if they are bijective, injective or superjective functions.

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